Orientational averaging of integrated cross sections in the discrete dipole method
Orientational averaging of integrated cross sections in the discrete dipole method
复制标题
离散偶极子法中积分截面的方向平均
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
N. Khlebtsov
中科院分区：
文献类型：
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作者：
N. Khlebtsov
利用离散偶极子方法，得到了消光、吸收和散射的定向平均截面的精确和近似解析解。该解析解可用于计算由不同光学性质的初级粒子（空气中的烟尘和聚苯乙烯、金和银纳米粒子聚集体的水悬浮液）形成的分形团簇的积分截面。结果表明，两种聚体模型的平均分形维数与原始粒子和中间粒子的轨迹（弹道或布朗轨迹）和平均分形维数的差异，给出了接近的平均消光截面值。
Using the discrete dipole method, exact and approximate analytical solutions for orientation-averaged cross sections for extinction, absorption, and scattering of light are obtained. The analytical solutions can be applied to the calculation of integrated cross sections of fractal clusters formed by primary particles with different optical properties (soot in air and aqueous suspensions of aggregates of polystyrene, gold, and silver nanoparticles). It is shown that two models of aggregates that differ only in trajectories (ballistic or Brownian) of primary particles and intermediate clusters and in average fractal dimensions give close values of averaged extinction cross sections.